[HarfBuzz] Accent positioning with greek smallcaps

[Georg Duffner]

Hello,

There seems to be something wrong with accent positioning in greek 
smallcaps with a ccmp feature enabled. In EB Garamond I’ve put together 
a feature (as stylistic set ss20) that decomposes all composed 
characters and mark and mkmk anchors are in place where needed. This all 
works nicely with Harfbuzz except for greek smallcaps as you can see at 
http://georgduffner.at/ebgaramond/greektests.html (with Firefox of 
course). Accents are placed in front of the letters at the bottom 
instead of atop of the letters. The last row of “Smallcaps” shows that 
latin smallcaps are fine, simple ones as well as stacked ones. I got the 
same results with hb-view (harfbuzz 0.9.9 on Arch Linux).

Results from hb-shape are:

1: (ἂἅἇ)
1: <U+1F02,U+1F05,U+1F07>
1: 
[alpha.sc=0+549|uni0313.grksc=0 at -751,-630+0|gravecomb.grkstacksc=0 at -626,-630+0|alpha.sc=1+549|uni0314.grksc=1 at -751,-630+0|acutecomb.grkstacksc=1 at -626,-630+0|alpha.sc=2+549|uni0314.grkstacksc=2 at -684,-665+0|uni0342.sc=2 at -771,-489+0]

and

1: (áäấÄÖÜ)
1: <U+00E1,U+00E4,U+1EA5,U+00C4,U+00D6,U+00DC>
1: 
[a.sc=0+549|acutecomb.sc=0 at -319,65+0|a.sc=1+549|uni0308.sc=1 at -421,84+0|a.sc=2+549|uni0302.stacksc=2 at -389,65+0|acutecomb.stacksc=2 at -197,167+0|Adieresis.deu=3+684|Odieresis.deu=4+763|Udieresis.deu=5+738]

I attach the results from hb-view.
The options used are:
--features="ss20","smcp"

You can find the font used in the tests at 
http://georgduffner.at/ebgaramond/tests/EBGaramond12-Regular.otf (it is 
too big for the limit of this list, even when compressed).

Please note that the testpage on the web uses a version of the font 
where the decomposition table is included in ccmp which I don’t want to 
because this should only be enabled when really necessary. But it 
doesn’t make a difference.

Best regards,
Georg
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